Oil well pump



E. J. MULLINS `OII.. WELL PUMP Feb`.16, 1954 File'd Sept. 22,4 1950 2Sheets-Sheet l E. J. MULLINS OIL WELL PUMP Feb. 16, 1954 Filed sept. 22.195o 2 Sheets-Sheet 2 Arme/Vin Patented Feb. 16, 1.954

2,669,190 on. WELL PUMP Edward J. Mullins, Los Angeles, Calif., assignorto Alfred H. Bakke, Evanston, Ill.

Apeueeuen september 22, 195o, serial No. l186,148

claims. (ci. 10a-179) 1 This invention relates to an oil well pump, andparticularly to a pump capable of ejecting low gravity or heavy oil froma well, and also a pump which is efficient in its operation and can,therefore, effectively and economically pump wells which have a smalloil output.

An object of my invention is to provide a novel oil well pump which issimple in construction, inexpensive to manufacture, and which requireslittle machine work on the barrel or on the pistons.

Still another object of my invention is to provide a novel oil well pumpassembly in which the oil is withdrawn from the upper portion of theperforated liner, thereby reducing the possibility of thepump sanding upor becoming gas bound.

A feature of my invention lresides in the novel arrangement andpositioning of a packer below the pump, and this packer resting on topof the perforated liner and sealing off the top of this liner so thatoil or other liquids cannot drop back into the top of the liner. n

A further feature of my invention is to provide a novel oil well pumpcon-.struction in which the pistons are formed with flexible packingthereon to engage the wall of the barrel, and a novel upper valveassembly in the pump through which the sucker rods extend.

Other objects, advantages and features of invention may appear from theaccompanying drawing, the subjoined detailed description andv theappended claims.

In the drawing:

Figure 1 is a fragmentary longitudinal sectional view of the lowerportion of my oil well pump assembly.

Figure 2 is a fragmentary longitudinal sectional view of the upperportion of my oil well pump assembly.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is a sectional view taken on line 4-4 of Figure 3.

Figure 5 is a fragmentary longitudinal sectional view of the sucker rodcoupling.

Figure S is a sectional View taken on line 6-6 ofFigure 1.

Figure 'lA is a sectional view taken on line 'I-1 of Figure 6.

.. Figure 10 is a side elevation of the oil draining device with ypartsbrokenaway to show inte.-

rior construction.

Referring more particularly to the drawing, the numeral I indicates theusual casing in the well, which extends from top to bottom of the well.The usual perforated liner is indicated at 2, and this liner ispositioned within the oil sand and is cemented to the casing I, as shownat 3, all of which is usual and well known in the art.

My pump consists of an elongated barrel 4 on the upper end of which Iprovide a reducing sub. This sub 5 is threaded on to the `barrel and thepurpose of this' sub is to provide an attachment for the tubing 6, whichscrews on to 0r into the sub and the tubing is of smaller diameter thanthe barrel il. The tubing 6 extends to the surface and oil is withdrawnfrom the well through this tubing, all of which is usual and well known.

A reducing fitting l screws on to the lower end of the barrel 4, and anipple 8 screws on to the fitting l and into the sleeve 9 of the packerI0. An intake pipe II screws into the bottom of the sleeve 9 and extendsdownwardly into the liner 2. The upper end of the intake pipe II isperforated, as shown at I2, and oil is drawn through these perforatonsfrom the upper part of the liner 2, substantially as shown in Figure 1.The lower part I3 of the pipe I I may consist of a settling basin forthe purpose of accumulating sand.

The packer I0 surrounds the pipe II, as previously described, andnormally is somewhat smaller in outside diameter than the inside of thecasing I. The packer I0 rests on top of the liner 2, as shown in Figure1, and weight of the pump assembly and tubing will compress the packerI0, causing the peripheral packing I4 to expand and seal the space abovethe top or open end of the liner 2, thus preventing any liquid fromowing back into the top of the liner. Any liquid which might seep intothe casing I from upper levels is thus prevented from flowing back intothe top of the liner 2. A standing valve I5 is seated in the fitting 'Iand performs the usual function of a standing valve in a pump.

The upper Valve assembly and packing I6 consists of a shell Il' whichscrews into the sub 5, or is otherwise iXedly mounted in this sub. Aplurality of oil ports I8 are arranged adjacent the periphery of theshell Il and each port is controlled by a ball valve I9, which seats inthe port. A packing gland 20 surrounds the sucker rod 2| and preventsleakage of oil around the sucker rod and back into the pump. The

sucker rod 2| and within the barrel l4 of the' pump. The pistons 22 arespaced vertically, substantially as shown in Figure l. The pistons areall identical in construction and each is provided with a rubber sleeve23 which engages the wall of the barrel 4. The rubber sleeved pistons 22will thus effectively operate in a barrel even though the inner surfaceof this barrel is not accurately machined or finished.

A plurality of oil ducts 24 extend vertically through each of thepistons 22 and each duct is controlled by a ball valve 25. The suckerrods 2l are secured to each of the pistons 22 and a nut 26 screws on tothe lower end of the sucker rod, and this nut is provided with a slot 2lwhich can engage the bumper bar 28 for the purpose of unscrewing thesucker rods from the piston when desired. A sucker rod coupling 29, ofusual and well known construction, is provided above the valve assemblyI6 so that the entire pump can be assembled iirst and then attached tothe sucker rods at the time it is lowered into the oil well.

Just above the pump, I may provide a iluid drain for the tubing E andincluded as a part of the tubing, which consists of a sleeve 30,extending oVer the riser 3l. The riser is threaded into the tubing 6, asshown. An elongated slot 32 in the riser is normally covered by thesleeve 30, and consequently oil cannot leak out of this. slot, however,if the tubing 6 is pulled upwardly at the surface, the slot 32 will beuncovered and oil can then drain back. into the casing l so that thereis no fluid in the tubing when this tubing is removed from the well. Thesleeve 30 is threaded on to the upper porn tion of the tubing S, 'asshown in Figure 2.

Reciprocation of the sucker rods 2t from the surface of the well willmove the pistons 22 in the barrel d. On` the up-stroke of the pistonsthe ball valves 25 are seated and oil is drawn from the formation pastthe standing valve I5. Also, any oil above the pistons 22 on theup-stroke will be forced past the check valvesv I9 and thence upwardlyinto the tubing 6, and thence to the surface. On the down-stroke of thepistons 22, the standing valve i is closed, the valves 25 are open andoil passes through the ducts 24 to the space above the pistons 22, andwithin the barrel 4.

Having described my invention, I claim:

l. An oil well pump positioned in a casing, said pump comprising abarrel, a pipe extending downwardly from the barrel, said pipe havingperiorations therein to admit oil, an expandible packer mounted on thepipe below the barrel, said packer engaging the casing when expanded, astanding valve in the lower end of the barrel, a piston reciprocallymounted in the barrel, an upper valve assembly mounted in the upper endof the barrel, said upper valve assembly having fluid ports extendingvertically therethrough, and a ball check Valve seated in each of saidfluid ports, a sucker rod attached to the piston, said sucker rodpassing through the upper valve assembly, and a packing gland in saidupper valve assembly surrounding the sucker rod, tubing `attached to theupper end of said barrel and rising therefrom, said tubing having anelongated slot cut therein above said barrel, and a sleeve surroundingsaid tubing, said. sleeve being movable longitudinally to uncover saidslot, said sleeve being attached to the tubing.

2. An oil well pump positioned 'in a casing and a perforated liner atthe lower end of the casing., said vpump comprising `a barrel, 'a pipeextending downwardly from the barrel into the perforated liner, saidpipe having perforations therein to admit oil, an expandible packermounted on the pipe below the barrel and positioned immediately abovethe liner, said packer engaging the casing when expanded, a standingvalve in the lower end of the barrel, a piston reciprocally mounted inthe barrel, an upper valve assembly mounted in the upper end of thebarrel, said upper Valve assembly having fluid ports extendingvertically therethrough, and a ball check valve seated in each of saidfluid ports, a sucker rod attached to the piston, said sucker rodpassing through the upper valve assembly, and a packing gland in saidupper valve assembly, surrounding the sucker rod, said piston includingva rubber packing engaging the barrel and said piston having oil ductsextending longitudinally therethrough, and a ball check valve seated ineach of said ducts.

3. An oil well pump positioned in a casing and a perforated liner at thelower end of the casing, said pump comprising a barrel, a pipe eX-tending downwardly from the barrel into the perforated liner, said pipehaving perforations therein to admit oil, an expandable packer mountedon the pipe below the barrel and positioned immediately above the liner,said packer engaging the casing when expanded, a standing valve in thelower end of the barrel, a piston reciprocally mounted in the barrel, anupper valve assembly mounted in the upper end of the barrel, said uppervalve assembly having fluid ports extending vertically therethrough, anda ball cheer` valve seated in each of said fluid ports, a sucker rodattached to the piston, said sucker rod passing through the upper valveassembly, and a packing gland in said upper valve assembly, surroundingthe sucker rod, said piston including a rubber packing engaging thebarrel and said piston having oil ducts extending longitudinallytherethrough, and a ball check valve seated in each of said chiots,tubing attached to the upper end of said barrel and rising therefrom,said tubing having an elongated slot cut therein above said barrel, anda sleeve surrounding said tubing, said sleeve being movablelongitudinally to uncover said slot, said sleeve being attached to thetubing.

4'. An oil well pump positioned in a casing and above a perforated oilliner, said pump comprising a stationary barrel, an upper valve assemblythreaded into the barrel at the upper end thereof, said. upper valveassembly having fluid ports extending vertically therethrough and a ballcheck valve seated in each of said fluid ports, a piston reciprocallymounted in the barrel, a rubber sleeve on the piston, a sucker rod, thepiston being attached to the sucker rod, said sucker rod extendingthrough the upper valve assembly, a packing gland on the upper valveassembly surrounding the sucker rod, said piston having a plurality ofducts extending vertically therethrough, a ball check valve seated ineach of the ducts, a standing` valve seated in the lower end of thebarrel, a pipe depending from the lower end oi the pump, an expandiblepacker surrounding the pipe and mounted thereon, said packer resting onthe perforated liner, and engaging the casing when expanded, said pipebeing perforated below the packer and within the liner.

5. An oil well pump positioned in a casing and above a perforated oilliner, said pump cornprising a stationary barrel, an upper valve as- 5sembly threaded into the barrel at the upper end thereof, said uppervalve assembly having uid ports extending vertically therethrough and aball check valve seated in each of said uid ports, a piston reciprocallymounted in the barrel, a rubber sleeve on the piston, a sucker rod, thepiston being attached to the sucker rod, said sucker rod extendingthrough the upper Valve assembly, a packing gland on the upper Valveassembly surrounding the sucker rod, said piston having a plurality ofducts extending vertically therethrough, a ball check valve seated ineach of the ducts, a standing valve seated in the lower liner, tubingattached to the upper end of said barrel and rising therefrom, saidtubing having an elongated slot out therein above said barrel, and asleeve surrounding said tubing, said sleeve being movable longitudinallyto uncover said slot, said sleeve being attached to the tubing.

EDWARD J. MULLINS.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 1,542,248 Howe June 16, 1925 1,601,676 Burright Sept. 28, 19261,704,776 Waitz Mar. 12, 1929 1,929,827 Roberts Oct. 10, 1933 1,959,621Fry May 22, 1934 2,188,656 Guiberson Jan. 30, 1940 2,369,008 BeecherFeb. 6, 1945

